Acronym for Inflated Lat Syndrome. ILS is a primal threat/mating display observed in the human male. The ILS display involves the male human holding out it’s arms away from it’s body at approximately a 20-40 degree angle and then walking with a slow deliberate gait inorder to look more imposing to other humans. The posture is used primarily as a form of non-verbal communication such as a mating display to attract or impress females or as a defense or dominance posture to appear larger to a threat or to intimidate rival males.

ILS displays can be observed :
In the gym after an insecure male works out for 3-5 minutes.
On the beach when a single male approaches a group of females.
When a male enters a bar or dance club.
When a male is too scared to throw the first punch in a fight.
On the outside of mosh pits by the bouncer who’s had enough of sweaty punks bumping in to him.

Dude. Check the wigger with ILS and a bad attitude coming through the door, he must think he’s the shit or something. Lets kick his ass later.

I.L.S. or Imaginary Lat Syndrome is an ailment suffered by men who walk around with thier arms further away from their lats (latimus dorsi), the muscle on the side of thier torso, to create the illusion that their lats (and physiques) are much bigger than they are.

Did you see Leah's new boyfried? The kid's got I.L.S. He think he's big but he's only like a buck fifty.

Usually ILS sufferers are guys that refuse to work out, but nonetheless hold their arms out at about a 45 degree angle from their body as if to say "hey it's hard bein' this ripped" Also called "the cobra" Often times coupled with the very popular IGS or Invisible Girdle Syndrome.